<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>GstVideoSink: GStreamer Base Plugins 1.0 Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
<link rel="up" href="gstreamer-video.html" title="Video Library">
<link rel="prev" href="gst-plugins-base-libs-GstVideoScaler.html" title="GstVideoScaler">
<link rel="next" href="GstColorBalance.html" title="GstColorBalance">
<meta name="generator" content="GTK-Doc V1.28 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#GstVideoSink.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#GstVideoSink.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#GstVideoSink.properties" class="shortcut">Properties</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-video.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="gst-plugins-base-libs-GstVideoScaler.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="GstColorBalance.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="GstVideoSink"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstVideoSink.top_of_page"></a>GstVideoSink</span></h2>
<p>GstVideoSink — Base class for video sinks</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstVideoSink.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstVideoSink.html#GST-VIDEO-SINK-HEIGHT:CAPS" title="GST_VIDEO_SINK_HEIGHT()">GST_VIDEO_SINK_HEIGHT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstVideoSink.html#GST-VIDEO-SINK-PAD:CAPS" title="GST_VIDEO_SINK_PAD()">GST_VIDEO_SINK_PAD</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstVideoSink.html#GST-VIDEO-SINK-WIDTH:CAPS" title="GST_VIDEO_SINK_WIDTH()">GST_VIDEO_SINK_WIDTH</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstVideoSink.html#gst-video-sink-center-rect" title="gst_video_sink_center_rect ()">gst_video_sink_center_rect</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstVideoSink.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody><tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="GstVideoSink.html#GstVideoSink--show-preroll-frame" title="The “show-preroll-frame” property">show-preroll-frame</a></td>
<td class="property_flags">Read / Write / Construct</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstVideoSink.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstVideoSink.html#GstVideoSink-struct" title="struct GstVideoSink">GstVideoSink</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstVideoSink.html#GstVideoSinkClass" title="struct GstVideoSinkClass">GstVideoSinkClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle">GstVideoRectangle</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstVideoSink.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
                <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSink.html#GstBaseSink-struct">GstBaseSink</a>
                    <span class="lineart">╰──</span> GstVideoSink
</pre>
</div>
<div class="refsect1">
<a name="GstVideoSink.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/video/video.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstVideoSink.description"></a><h2>Description</h2>
<p>Provides useful functions and a base class for video sinks.</p>
<p>GstVideoSink will configure the default base sink to drop frames that
arrive later than 20ms as this is considered the default threshold for
observing out-of-sync frames.</p>
</div>
<div class="refsect1">
<a name="GstVideoSink.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GST-VIDEO-SINK-HEIGHT:CAPS"></a><h3>GST_VIDEO_SINK_HEIGHT()</h3>
<pre class="programlisting">#define GST_VIDEO_SINK_HEIGHT(obj) (GST_VIDEO_SINK_CAST (obj)-&gt;height)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-SINK-PAD:CAPS"></a><h3>GST_VIDEO_SINK_PAD()</h3>
<pre class="programlisting">#define GST_VIDEO_SINK_PAD(obj) GST_BASE_SINK_PAD(obj)
</pre>
<p>Get the sink <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct"><span class="type">GstPad</span></a> of <em class="parameter"><code>obj</code></em>
.</p>
<div class="refsect3">
<a name="GST-VIDEO-SINK-PAD.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>obj</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstVideoSink.html" title="GstVideoSink"><span class="type">GstVideoSink</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-SINK-WIDTH:CAPS"></a><h3>GST_VIDEO_SINK_WIDTH()</h3>
<pre class="programlisting">#define GST_VIDEO_SINK_WIDTH(obj) (GST_VIDEO_SINK_CAST (obj)-&gt;width)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-sink-center-rect"></a><h3>gst_video_sink_center_rect ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_sink_center_rect (<em class="parameter"><code><a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> src</code></em>,
                            <em class="parameter"><code><a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> dst</code></em>,
                            <em class="parameter"><code><a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> *result</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> scaling</code></em>);</pre>
<p>Takes <em class="parameter"><code>src</code></em>
 rectangle and position it at the center of <em class="parameter"><code>dst</code></em>
 rectangle with or
without <em class="parameter"><code>scaling</code></em>
. It handles clipping if the <em class="parameter"><code>src</code></em>
 rectangle is bigger than
the <em class="parameter"><code>dst</code></em>
 one and <em class="parameter"><code>scaling</code></em>
 is set to FALSE.</p>
<div class="refsect3">
<a name="gst-video-sink-center-rect.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>src</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> describing the source area</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>dst</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> describing the destination area</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>result</p></td>
<td class="parameter_description"><p>a pointer to a <a class="link" href="GstVideoSink.html#GstVideoRectangle" title="struct GstVideoRectangle"><span class="type">GstVideoRectangle</span></a> which will receive the result area</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>scaling</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> indicating if scaling should be applied or not</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstVideoSink.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstVideoSink-struct"></a><h3>struct GstVideoSink</h3>
<pre class="programlisting">struct GstVideoSink {
  gint width, height;
};
</pre>
<p>The video sink instance structure. Derived video sinks should set the
<em class="parameter"><code>height</code></em>
 and <em class="parameter"><code>width</code></em>
 members.</p>
<div class="refsect3">
<a name="GstVideoSink.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoSink-struct.width"></a>width</code></em>;</p></td>
<td class="struct_member_description"><p>video width (derived class needs to set this)</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoSink-struct.height"></a>height</code></em>;</p></td>
<td class="struct_member_description"><p>video height (derived class needs to set this)</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoSinkClass"></a><h3>struct GstVideoSinkClass</h3>
<pre class="programlisting">struct GstVideoSinkClass {
  GstBaseSinkClass parent_class;

  GstFlowReturn  (*show_frame) (GstVideoSink *video_sink, GstBuffer *buf);
};
</pre>
<p>The video sink class structure. Derived classes should override the
<em class="parameter"><code>show_frame</code></em>
 virtual function.</p>
<div class="refsect3">
<a name="GstVideoSinkClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody><tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoSinkClass.show-frame"></a>show_frame</code></em> ()</p></td>
<td class="struct_member_description"><p>render a video frame. Maps to <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSink.html#GstBaseSinkClass.render"><code class="function">GstBaseSinkClass.render()</code></a> and
<a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSink.html#GstBaseSinkClass.preroll"><code class="function">GstBaseSinkClass.preroll()</code></a> vfuncs. Rendering during preroll will be
suppressed if the <a class="link" href="GstVideoSink.html#GstVideoSink--show-preroll-frame" title="The “show-preroll-frame” property"><span class="type">“show-preroll-frame”</span></a> property is set to
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p></td>
<td class="struct_member_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoRectangle"></a><h3>struct GstVideoRectangle</h3>
<pre class="programlisting">struct GstVideoRectangle {
  gint x;
  gint y;
  gint w;
  gint h;
};
</pre>
<p>Helper structure representing a rectangular area.</p>
<div class="refsect3">
<a name="GstVideoRectangle.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoRectangle.x"></a>x</code></em>;</p></td>
<td class="struct_member_description"><p>X coordinate of rectangle's top-left point</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoRectangle.y"></a>y</code></em>;</p></td>
<td class="struct_member_description"><p>Y coordinate of rectangle's top-left point</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoRectangle.w"></a>w</code></em>;</p></td>
<td class="struct_member_description"><p>width of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoRectangle.h"></a>h</code></em>;</p></td>
<td class="struct_member_description"><p>height of the rectangle</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstVideoSink.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstVideoSink--show-preroll-frame"></a><h3>The <code class="literal">“show-preroll-frame”</code> property</h3>
<pre class="programlisting">  “show-preroll-frame”       <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></pre>
<p>Whether to show video frames during preroll. If set to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, video
frames will only be rendered in PLAYING state.</p>
<p>Flags: Read / Write / Construct</p>
<p>Default value: TRUE</p>
</div>
</div>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.28</div>
</body>
</html>